Individuals not seeing first supernatural beings (5)
I believe the answer is:
elves
'supernatural beings' is the definition.
(elf is a kind of supernatural being)
'individuals not seeing first' is the wordplay.
'individuals' becomes 'selves' (self is a kind of individual).
'not seeing first' means to remove the first letter.
'selves' with its initial letter removed is 'ELVES'.
(Other definitions for elves that I've seen before include "Legendary little beings" , "Sprites" , "Imps, pixies" , "Little people" , "Fairy-like beings" .)